The Federal Bureau of Mines has derived a mathematical expression for the emulsion calibration curve used in optical emission spectroscopy. Employing a two-step preliminary curve method, an approximation of the first derivative of the calibration curve is formed and integrated. The final equation is
where I is the line intensity, S is the transform that linearizes the preliminary curve, and α and β are constants.
AhrensL. H.TaylorS. R., Spectrochemical Analysis (Addison-Wesley, Reading, MA, 1961), p. 148.
2.
BlevinsD. R.O'NeillW. R., Appl. Spectrosc, 30, 190 (1976), and included references.
3.
Methods for Emission Spectrochemical Analysis (American Society for Testing and Materials, March 1971), p. 74.
4.
StraussB. H., Talanta24, 524 (1977), and included references.
5.
We use a Jarrell-Ash 3.4 m Wadsworth Mount spectrograph, 3 step sector, step ratio 2, and a Jarrell-Ash microdensitometer; emulsion: Kodak SA-1, developer D 19.
6.
Reference to specific brands is made for identification only and does not imply endorsement by the Bureau of Mines.
